Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Activities:
Net income	$ 808	$ 689
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	19	20
Amortization of intangibles	31	29
Provision for losses on accounts receivable	10	10
Deferred income taxes	(3)	(6)
Stock-based compensation	19	11
Gain on dispositions	(2)	(7)
Other	19	29
Changes in operating assets and liabilities, net of effect of acquisitions and dispositions:
Accounts receivable	65	76
Prepaid and other current assets	(56)	(52)
Accounts payable and accrued expenses	(239)	(251)
Unearned revenue	(61)	(12)
Other current liabilities	25	49
Net change in prepaid/accrued income taxes	172	125
Net change in other assets and liabilities	(39)	(30)
Cash provided by operating activities	768	680
Investing Activities:
Capital expenditures	(18)	(11)
Acquisitions, net of cash acquired	(9)	(183)
Proceeds from disposition	2	0
Changes in short-term investments	1	11
Cash used for investing activities	(24)	(183)
Financing Activities:
Dividends paid to shareholders	(186)	(161)
Distributions to noncontrolling interest holders, net	(69)	(51)
Repurchase of treasury shares	0	(1,153)
Exercise of stock options	3	8
Employee withholding tax on share-based payments	(41)	(44)
Cash used for financing activities	(293)	(1,401)
Effect of exchange rate changes on cash	(55)	(30)
Net change in cash, cash equivalents, and restricted cash	396	(934)
Cash, cash equivalents, and restricted cash at beginning of period	4,122	2,886
Cash, cash equivalents, and restricted cash at end of period	$ 4,518	$ 1,952